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DHA Computed Tomography - Reviews


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See why our users from 154 countries love us for their exam prep! Including 170 reviews for the DHA Computed Tomography exam.

Exam Edge is an industry leader in online test prep. We work with institutional partners to offer a wide array of practice tests that will help you prepare for your big exam. No matter how niche your field of interest might be, we're here to help you prepare for test day.

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DHA Computed Tomography - Test Reviews Sample Questions

When a CT test is started, the __________ would be considered the first picture taken?

Correct Answer:
scout
when a ct (computed tomography) test is initiated, the first image acquired is commonly referred to as the **scout** image. this image serves several critical functions in the process of ct imaging.

the scout image, also known variously as a pilot image, topogram, or cr (computed radiography) image, is essentially an initial overview or preview scan. it is typically a two-dimensional image, much like a standard x-ray. the primary purpose of the scout image is to help the radiologist or technician plan the subsequent, more detailed series of ct scans. this planning involves selecting the precise areas to be imaged, determining the angles, and setting the boundaries for the slices that will be taken during the main ct scan.

the scout scan is crucial because it ensures that the ct images are accurately focused on the area of interest, thereby avoiding unnecessary radiation exposure to other parts of the body. moreover, it aids in optimizing the quality of the subsequent images, as the settings can be adjusted based on the initial scout view to provide the best possible detail where it is most needed.

in essence, while the scout image might appear simple and less detailed compared to the full ct scans that follow, it plays a pivotal role in the safety and effectiveness of the overall diagnostic process. thus, when a ct test is started, the "scout" would be considered the first picture taken.

Which of the following generations of CT scanners possess the characteristics of pencil-thin x-ray beam?

Correct Answer:
first-generation


the correct answer is first-generation. the first-generation of ct (computed tomography) scanners, developed in the early 1970s, utilized a pencil-thin x-ray beam to produce images. this type of scanner featured a narrow, highly collimated x-ray beam that measured only a few millimeters in diameter, often referred to as the "pencil beam." this beam was directed at the patient and would rotate around the body in a single plane.

the design of first-generation ct scanners involved the x-ray source and a single detector moving synchronously across the patient's body, scanning one slice at a time through a linear translation followed by a small rotation. this process was repeated in a stepwise fashion to complete a full 360-degree rotation, allowing for the collection of multiple projections that were then reconstructed into a two-dimensional image slice of the scanned area.

second-generation ct scanners, developed shortly after the first, featured a fan-shaped x-ray beam that covered a larger area than the pencil beam. this advancement allowed for faster scanning times and the collection of multiple slices simultaneously. the detectors in these systems were also typically arranged in an array, unlike the single detector used in first-generation systems.

third-generation ct scanners, a further advancement, employed an even wider fan-shaped x-ray beam and a curved detector array that remained stationary as the x-ray source rotated around the patient. this design significantly improved the speed and efficiency of data collection.

in summary, among the options provided, only the first-generation ct scanners are characterized by the use of a pencil-thin x-ray beam. this technology marked the beginning of ct scanning and laid the foundation for subsequent developments in the field.